Audi Audi Q8 2018-present

Audi Audi Q8 2018-present Exhaust Specifications

Detailed technical specifications for the 2018-Present Audi Q8 exhaust system, covering components, materials, dimensions, and performance. Essential for technicians and enthusiasts.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the exhaust specifications for the 2018-Present Audi Q8, including key features, measurements, and technical details. This section covers the design, materials, performance, and maintenance aspects of the exhaust system.

How to Use

Use the search function to locate specific exhaust specifications by entering keywords such as 'catalytic converter', 'muffler', or 'exhaust pipe diameter'.

Navigate through the documentation sections using the table of contents or by scrolling through the major sections and subsections listed below.

Key Specifications

Exhaust Pipe Diameter

70 mm (2.75 in)

Catalytic Converter Cells

400 cells per square inch

Maximum Flow Rate

450 L/s

Backpressure

< 0.5 bar

Idle Noise Level

45 dB(A)

Available Specifications

Exhaust System Design

Details about the design and layout of the Audi Q8 exhaust system, including component placement and integration with the vehicle's chassis.

Exhaust Pipe Configuration

Dual exhaust system with quad tailpipes
Stainless steel construction for durability
Pipe diameter: 70 mm (2.75 in)
Optimized for minimal backpressure and maximum flow efficiency

Catalytic Converter

High-efficiency three-way catalytic converter
Ceramic substrate with 400 cells per square inch
Oxygen sensor integration for precise emissions control
Operating temperature range: 400°C to 800°C (752°F to 1472°F)

Note: Ensure proper functioning of oxygen sensors to maintain emissions compliance.

Performance Specifications

Technical details about the exhaust system's performance, including flow rates, backpressure, and noise levels.

Exhaust Flow Rate

Maximum flow rate: 450 liters per second (L/s)
Designed for engines up to 4.0L V8
Backpressure: < 0.5 bar at full load
Optimized for turbocharged engines

Noise Levels

Idle noise level: 45 dB(A)
Full throttle noise level: 75 dB(A)
Active exhaust valve for sound modulation
Complies with EU noise regulations

Maintenance and Service

Guidelines for maintaining and servicing the Audi Q8 exhaust system, including inspection intervals and replacement parts.

Inspection Intervals

Inspect exhaust system every 15,000 km (9,320 miles)
Check for leaks, corrosion, and loose components
Verify oxygen sensor functionality
Replace catalytic converter if efficiency drops below 95%

Replacement Parts

OEM catalytic converter part number: 4M0254100
Exhaust gasket thickness: 2.5 mm (0.1 in)
Recommended torque for exhaust bolts: 25 Nm (18.4 lb-ft)
Use only Audi-approved replacement parts

Note: Improper installation of replacement parts may void the warranty.

Search Specifications

Search by specification name, value, or description

Component Specifications

General Specifications

Material: Stainless steel

System Type: Dual exhaust with integrated mufflers

Emission Compliance: Euro 6d-TEMP

Part Number: 4M0253600A

Weight: 28.5 kg

Exhaust Manifold

Material: Cast iron

Part Number: 07L253033H

Bolt Torque: 25 Nm + 90°

Gasket Part Number: 07L253119A

Heat Shield Material: Aluminized steel

Catalytic Converter

Type: Three-way catalytic converter

Part Number: 4M0254100B

Substrate Material: Ceramic

Precious Metals

Platinum
Palladium
Rhodium

Operating Temperature: 400°C - 800°C

Efficiency: > 98%

Oxygen Sensors

Upstream Sensor Part Number: 06E906262L

Downstream Sensor Part Number: 06E906262M

Operating Voltage: 0.1V - 0.9V

Response Time: < 100 ms

Replacement interval: 100,000 miles

Mufflers

Material: Stainless steel

Part Number: 4M0253609A

internal Baffles: Perforated tube design

Noise Reduction: 25 dB

Mounting Bracket Torque: 40 Nm

Exhaust Pipes

Diameter: 70 mm

Material: Stainless steel

Wall Thickness: 1.5 mm

Flex Pipe Part Number: 4M0253125C

Clamp Torque: 25 Nm

Exhaust Tips

Material: Chrome-plated stainless steel

Part Number: 4M0253800D

Diameter: 90 mm

Length: 150 mm

Finish: Polished

Exhaust Valve System

Type: Electronically controlled valve

Part Number: 4M0253825E

Actuator Voltage: 12V DC

Response Time: < 200 ms

Operating Temperature Range: -40°C to 120°C

Emission Control

EGR System: Integrated with exhaust manifold

Particulate Filter: Diesel particulate filter (DPF)

DPF Part Number: 4M0254105F

Regeneration Temperature: 600°C

Regeneration interval: 300 - 600 miles

Diagnostic Specifications

OBDII Codes

P0420
P0430
P0135
P0141

Sensor Resistance: 6 - 10 ohms

Exhaust Backpressure Limit: 0.5 bar

Leak Test Pressure: 0.3 bar

Service Information Service

Detailed service requirements and schedules for the exhaust system

10,000

Inspect exhaust system for leaks
Check oxygen sensor functionality
Inspect catalytic converter for damage

Visual and functional inspection required

50,000

Replace oxygen sensors
Inspect and clean particulate filter
Check exhaust valve operation

Follow manufacturer guidelines for sensor replacement

100,000

120

Replace catalytic converter if efficiency drops below 95%
Inspect and replace exhaust gaskets
Check muffler and pipes for corrosion

Full system inspection recommended

Frequently Asked Questions

Find answers to common questions about torque specifications

What is the exhaust system configuration for the 2018-Present Audi Q8?

The 2018-Present Audi Q8 features a dual exhaust system with two tailpipes, each measuring 90mm in diameter. The system includes a catalytic converter, particulate filter, and muffler designed to meet Euro 6 emissions standards.

What materials are used in the Audi Q8 exhaust system?

The Audi Q8 exhaust system is constructed from high-grade stainless steel, ensuring durability and resistance to corrosion. The tailpipes are chrome-plated for a premium finish.

How often should the exhaust system be inspected?

Audi recommends inspecting the exhaust system every 15,000 miles or annually, whichever comes first. This includes checking for leaks, corrosion, and ensuring all mounting points are secure.

Can the Audi Q8 exhaust system be upgraded for performance?

Yes, Audi offers a performance exhaust system upgrade for the Q8, which includes larger diameter pipes and a sport-tuned muffler for enhanced sound and airflow. This upgrade is compatible with all 2018-Present Q8 models.

What is the warranty coverage for the Audi Q8 exhaust system?

The exhaust system is covered under Audi's New Vehicle Limited Warranty for 4 years or 50,000 miles, whichever comes first. Performance exhaust upgrades may have different warranty terms.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

Audi Q8 Exhaust System Maintenance Guide

Coming Soon

Detailed guide on maintaining and inspecting the Audi Q8 exhaust system, including common issues and troubleshooting tips.

Audi Genuine Parts Catalog

Coming Soon

Official catalog of Audi genuine parts, including exhaust system components and performance upgrades for the Q8.

Audi Q8 Service Manual

Coming Soon

Comprehensive service manual for the Audi Q8, including detailed procedures for exhaust system repair and replacement.

Audi Warranty Information

Coming Soon

Official warranty information for the Audi Q8, including coverage details for the exhaust system and performance upgrades.

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